/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard;

import proguard.classfile.ClassConstants;
import proguard.classfile.Clazz;
import proguard.classfile.constant.Constant;
import proguard.classfile.constant.MethodrefConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.ClassUtil;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.util.WarningPrinter;

/**
 * This constant visitor checks whether visited method references try to access enclosing classes.
 *
 * @author Eric Lafortune
 */
public class GetEnclosingClassChecker extends SimplifiedVisitor implements ConstantVisitor {
    private final WarningPrinter notePrinter;

    /**
     * Creates a new GetEnclosingMethodChecker.
     */
    public GetEnclosingClassChecker(WarningPrinter notePrinter) {
        this.notePrinter = notePrinter;
    }

    // Implementations for ConstantVisitor.

    public void visitAnyConstant(Clazz clazz, Constant constant) {}

    public void visitMethodrefConstant(Clazz clazz, MethodrefConstant methodrefConstant) {
        String className = methodrefConstant.getClassName(clazz);

        if (className.equals(ClassConstants.NAME_JAVA_LANG_CLASS)) {
            String methodName = methodrefConstant.getName(clazz);

            if (methodName.equals(ClassConstants.METHOD_NAME_CLASS_GET_ENCLOSING_CLASS)
                || methodName.equals(ClassConstants.METHOD_NAME_CLASS_GET_DECLARING_CLASS)) {
                notePrinter.print(clazz.getName(),
                    "Note: " + ClassUtil.externalClassName(clazz.getName()) + " calls '"
                        + ClassUtil.externalShortClassName(ClassUtil.externalClassName(className)) + "." + methodName
                        + "'");
            }
        }
    }
}
